XML 122 R108.htm IDEA: XBRL DOCUMENT v3.19.1
Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Number of options        
Number of Options outstanding, Beginning Balance 545,590 451,668 210,297  
Number of Options, Granted 192,700 169,703 242,068  
Number of Options, Exercised (171,630) (62,197) (263)  
Number of Options, Forfeited (11,754) (11,495)    
Number of Options, Expired   2,089 434  
Number of Options outstanding, Ending Balance 554,906 545,590 451,668 210,297
Number of Options, Exerciseable 186,823      
Number of Options, Vested and Expected to Vest 545,299      
Options outstanding, Weighted Average Remaining Contract Term        
Options outstanding, Weighted Average Remaining Contract Term (Years) 8 years 8 years 4 months 24 days 8 years 4 months 24 days 8 years 6 months
Options exercisable, Weighted Average Remaining Contract Term (Years) 6 years 10 months 24 days      
Options vested and expected to vest, Weighted Average Remaining Contract Term (Years) 8 years      
Weighted average exercise price        
Options outstanding, Weighted Average Exercise Price, Beginning Balance $ 68.65 $ 62.29 $ 67.54  
Weighted Average Exercise Price, Granted 75.17 83.14 57.60  
Weighted Average Exercise Price, Exercised 63.66 63.44 18.25  
Weighted Average Exercise Price, Expired 75.17 70.22    
Weighted Average Exercise Price, Forfeited   18.25 18.25  
Options outstanding, Weighted Average Exercise Price, Ending Balance 72.31 $ 68.65 $ 62.29 $ 67.54
Options exercisable, Weighted Average Exercise Price 69.34      
Weighted Average Exercise Price, Vested and Expected to Vest $ 72.24      
Aggregate intrinsic value        
Options outstanding, Aggregate Intrinsic Value, Beginning Balance $ 2,679 $ 7,520 $ 218  
Options exercised, aggregate intrinsic value 2,707 1,132 12  
Options forfeited, aggregate intrinsic value 0 75    
Options expired, aggregate intrinsic value   137 15  
Options outstanding, Aggregate Intrinsic Value, Ending Balance 1,040 $ 2,679 $ 7,520 $ 218
Options exercisable, Aggregate Intrinsic Value 452      
Options vested and expected to vest, aggregate intrinsic value $ 1,038